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@ -1,6 +1,9 @@
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#!/usr/bin/env bash
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# Written by Draco (tytydraco @ GitHub)
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# Maximum unsigned integer size in C
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UINT_MAX="4294967295"
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write() {
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# Bail out if file does not exist
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[[ ! -f "$1" ]] && return 1
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@ -128,63 +131,80 @@ then
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write /dev/stune/top-app/schedtune.prefer_idle 1
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fi
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for cpu in /sys/devices/system/cpu/cpu*/cpufreq/
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# Loop over each CPU in the system
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for cpu in /sys/devices/system/cpu/cpu*/cpufreq
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do
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avail_govs="$(cat "${cpu}scaling_available_governors")"
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case "$avail_govs" in
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*schedutil*)
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write "${cpu}scaling_governor" schedutil
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# Fetch the available governors from the CPU
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avail_govs="$(cat "$cpu/scaling_available_governors")"
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# Stretch CPU bounds
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write "$cpu/scaling_max_freq" "$(cat "$cpu/cpuinfo_max_freq")"
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write "$cpu/scaling_min_freq" "$(cat "$cpu/cpuinfo_min_freq")"
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# Attempt to set the governor in this order
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for governor in schedutil interactive
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do
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# Once a matching governor is found, set it and break for this CPU
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if [[ "$avail_govs" == *"$governor"* ]]
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then
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write "$cpu/scaling_governor" "$governor"
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break
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fi
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done
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done
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# Apply governor specific tunables for schedutil
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find /sys/devices/system/cpu/ -name schedutil -type d | while IFS= read -r governor
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do
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# Consider changing frequencies once per scheduling period
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write "${cpu}schedutil/up_rate_limit_us" 5000
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write "${cpu}schedutil/down_rate_limit_us" 5000
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write "${cpu}schedutil/rate_limit_us" 5000
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write "$governor/up_rate_limit_us" 5000
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write "$governor/down_rate_limit_us" 5000
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write "$governor/rate_limit_us" 5000
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# Jump to max frequency at 90% load
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write "${cpu}schedutil/hispeed_load" 90
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write "${cpu}schedutil/hispeed_freq" "$(cat "${cpu}cpuinfo_max_freq")"
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;;
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*interactive*)
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write "${cpu}scaling_governor" interactive
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write "$governor/hispeed_load" 90
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write "$governor/hispeed_freq" "$UINT_MAX"
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done
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# Apply governor specific tunables for interactive
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find /sys/devices/system/cpu/ -name interactive -type d | while IFS= read -r governor
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do
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# Consider changing frequencies once per scheduling period
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write "${cpu}interactive/timer_rate" 5000
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write "${cpu}interactive/min_sample_time" 5000
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write "$governor/timer_rate" 5000
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write "$governor/min_sample_time" 5000
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# Jump to max frequency at 90% load
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write "${cpu}interactive/go_hispeed_load" 90
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write "${cpu}interactive/hispeed_freq" "$(cat "${cpu}cpuinfo_max_freq")"
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;;
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esac
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write "$governor/go_hispeed_load" 90
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write "$governor/hispeed_freq" "$UINT_MAX"
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done
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for queue in /sys/block/*/queue/
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for queue in /sys/block/*/queue
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do
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# Choose the first governor available
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avail_scheds="$(cat "${queue}scheduler")"
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avail_scheds="$(cat "$queue/scheduler")"
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for sched in cfq noop kyber bfq mq-deadline none
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do
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if [[ "$avail_scheds" == *"$sched"* ]]
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then
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write "${queue}scheduler" "$sched"
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write "$queue/scheduler" "$sched"
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break
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fi
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done
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# Do not use I/O as a source of randomness
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write "${queue}add_random" 0
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write "$queue/add_random" 0
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# Disable I/O statistics accounting
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write "${queue}iostats" 0
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write "$queue/iostats" 0
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# Only attempt simple merges
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write "${queue}nomerges" 1
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write "$queue/nomerges" 1
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# Reduce heuristic read-ahead in exchange for I/O latency
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write "${queue}read_ahead_kb" 16
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write "$queue/read_ahead_kb" 16
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# Reduce the maximum number of I/O requests in exchange for latency
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write "${queue}nr_requests" 64
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write "$queue/nr_requests" 64
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done
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# Always return success, even if the last write fails
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